Means for propelling vessels.



Y, l jF.'ISHY. f MEANS FORPROPELLING VESSELS.

`MPL10@.T'IQN FILED sBPTjv. 1905.

. .Patented May 2,5, 1909.

T72 verdor FVRKDERIK IsHY,

origipusiapiinafion med April 2o, 1904, serial To all whom it mayconcern: i

ILUNITED STATES PATENT onirica.

OF vCOIENl-IAGr'EII, DENMARK, ASSIGNOR TO AKTIESELSKABET KAPTAJ ISHOYSNY SKIBSTYPE, OF COPENHAGEN, DENMARK.

yiraniens Fon PRorELLING `vnssnns.

Beit known that I, FREDERIK IsHY, subject ofthevKing. of Denmark,residing at Copenhagen, in the Island of Seeland and- Kingdom ofDenmark, have invented certain new and useful Improvements in Means forI Pro elling Vessels; andvI do hereby declare means for propellingvesselsl or for reducing" a the resistance to the progress of vessels;

the ,ollowing to be a full, clear, and exact descriptionof theinvention, such as willV enable others skilled. in the lart to which itappertains to make and use, the same. y This inventionrelates toimprovements in by aid of pressure `exercised from below progress of theship, which .is caused by the `Wake-wave.

f Another purpose of` this invention is to pro-l l ,tectthe yscrews inV.vessels of thekind indi- .cated above by means of channels under thebottom of the shi which channels, however, must be so vbroa as to allowa satisfactory f development ofthe flow fromthe propellers.

`The present application is a division of `prior application 1904. I fIn` the vaccompanying drawing, Figure l e. 204,144., filed April 2o,

i' shows a ship the'screws'pf which are diskthe foreypart, it'beingsuposed, that the `pressure under thesaft part as become too .C so

strongFig.J3 is a view `ofl`i ;.'2 from below, `4, yshows Fi 3 frombehind, Fig. 5 shows Fig. 1 yfrom' be 'nd, Fig. 6 shows from behind aship'in which the channels are formed In Fignl/,ais the ships bottom, -ban under f boat containing the machinery. and crank shaft, c thepropeller shaft Vpenetrating one ,fend of thfiunderboat and tightenedbyj a packin box, d are the propellei's. The propeller s aft mayunderthe ships bottom be t v provided with'longltudmal projecting partssupported by one or several bearing stands.

,/At a suitable distance from the propeller j shafts are provided`downward projecting j partsr e undithe ships bottom, to be seen 5 1nFig. .5. QThesei projections protect ,the g Specification of Lettersliatent.

against' .the aft half of the ships bottom.; by the flow from thepropellers, and by aid yof 'enveloping the stern entirely into this flowf in order to preventl the resistance to the i Patented May 25, 190e`-screws against damage; They channels are usuallyv enlarged considerablytoward the stern, as shown in Fig. 3, thatthe iiowfrorn the propellersmay envelop the stern entirely. The cross section of the channels may bethe saine alongthev whole length, or

its shaft, under the aft part and two propel- `vlers under the fore partof the ship, as itis supposed, that the pressure under the aft part hasbecome too strong 'and therefore must be Counterbalanced by a suitablenun1- berV yo1@ counterbalancing propellers under the fore part of theship. Only in this case screws under the fore part of the ship may beallowed. The propeller shaft c projects from the under-boat bjon bothends and is likewise tightened by packing boxes. The downwardprojectingparts e of the hull are situated in a similar manner as inFig. 1, and the channels may also beenlarged toward the stern. Of courseit may be permissible to provide two or more propeller shafts and it maybe narrower under the` fore half of the channels under the ships bottom.It may also be permissible to provide two or several propeller shafts ina single' channel. e

In Fig. 3 are shown two propeller-shafts and channels under the samevessel. The number and arrangement of the propeller-s are the same as inFig. 2. The channels may be broader under the aft part of the ship thanunder the fore part or be ofthe same breadth as shown in dotted lines,they may be enlarged toward the stern as shown in the drawing. Theprojecting part in the middle of the bottom which is indieatedin dottedlines may be employed or not. The channels for conducting the llow fromthe propellers may also be formed by rails e, as shown in Fig. 6.l Inthis way the channels become considerably broader and the flow from theproplellers is utilized considerably.betterthan A 1n t e foreeoinoffigures.

what i iainisf 1. In ships, the combination ofia bottom j formedrelatively broad and flat over all its length from bow to sternandmerging into the bow and stern by a rounded outline and area of theships zbottom, 'an underboat, a

driving device placed in said'underboat, and

stern and including the greater' part of the 1 area of the ships bottom,an under-boat, a

said device and arranged under thev a'r't of the vessel 'in the channelclose to said iottorn, said Propellers beingv adapted to suck the Water1n front of the-stern downit to the stern, this diminishing the pressurefront by the propeller' suction, and increasing the pressure under theaft half ofthe vessel, and eliminating the vacuum at the *l stern by thepressure from the propellers.

` the bow and stern by a rounded outline,

2. :In ships, the combination of a bottom formed relatively broad andflat over all its `.propellers being arranged behind 'naine to thisspecification in the presence of length from stem to stern, and merginginto l rovided with longitudinal projecting parts forming na channelextending from stem tov and erated by said device driving device placedin said underboat, and a plurality of relatively small propeller-s opanddistributed unsyminetrieally, apreponderating number 'of said thebottoni, and the remainder in front of the center of gravity, plus ofpressure exercised under the aft half by a suitable pressure under thefore half of the vessel.

ln testimony whereof, l have signed my two subscribing witnesses.

FREDERIK IS'HOY.y Vitnesses:

FRANTZ JENSEN, C. SKENGELBERG.

. the center "of gravity of the ship in the channel under Ward into andthrough -the channel and lead i to counter-balance a sur-

